单钢管避雷针减振设计技术研究  

Study on vibration damping design of single-steel-pole lightning rod

作　　者：陈涛[1] 摇铖 王衔 余倩倩 Chen Tao;Yao Cheng;Wang Xian;Yu Qianqian College of Civil Engineering;Tongji University;Shanghai 200092;China）

机构地区：[1]同济大学土木工程学院

出　　处：《建筑结构》2018年第13期20-25,共6页Building Structure

摘　　要：单钢管避雷针的长细比过大,刚度较小,在风荷载作用下容易发生风致振动和涡激振动,导致避雷针的根部或法兰连接部位的焊缝或螺栓产生疲劳破坏。为了减少避雷针在风荷载下的振动,采取相关减振措施。采用有限元软件ABAQUS对结构进行建模分析,比较三种减振方案的不同效果。结果表明,基于特制调频质量阻尼器（TMD）的减振装置效果好并易于实施,在合理设计下能够显著减小振动;而内置预应力拉索方案没有明显的减振效果;采用灌浆加强的双法兰连接构造虽然未能减小振动,但是局部的加强有助于降低关键部位的应力水平,进而提高疲劳性能。此外,对格构式避雷针进行建模分析,与单钢管避雷针比较发现,格构式避雷针在风荷载下的力学性能优于单钢管式避雷针。Due to the large slenderness and small stiffness of the single-steel-pole lightning rod,wind-induced vibrations and vortex-induced vibrations happen frequently under wind load. Vibrations may cause fatigue damage at the root of the lightning rod or weld seams or bolts at the flange joint. Relevant measures were adopted to reduce the vibrations of lightning rods under wind load. Three different damping measures to reduce the vibration were analyzed by finite element software ABAQUS. The results of the analysis show that the damping device based on special tuned mass damper（TMD） can significantly reduce the vibration and it is easy to implement,and its reasonable design can significantly reduce vibration;built-in prestressed cable scheme cannot significantly reduce the vibration; grouting strengthened double-flange structure cannot reduce the vibrations,but local strengthening reduces stress levels at critical locations and improves the fatigue performance. In addition,the lattice typed lightning rod was modeled and analyzed. Compared with the single-steel-pole lightning rod,it is found that the mechanical properties of the lattice typed lightning rod are better than those of the singlesteel-pole lightning rod under the wind load.

关 键 词：避雷针 减振 调频质量阻尼器(TMD) 预应力拉索 双法兰 

分 类 号：TU895[建筑科学]